Punch



Nov.'22, 1932. J. K. DIAMOND PUNCH Filed Au A A f N INVENTOR Jc gqas K. iamond ATTORNEYS Patented Nov. 22, 1932 UNITED STATES PATENT OFFICE JAMES K. DIAMOND, F GRAND RAPIDS, MICHIGAN, ASSIGNOR T0 CLIPPER BELT LACER COMPANY, 013 GRAND RAPIDS, MICHIGAN PUNCH Application filed. August 5, 1931.

The main objects of this invention are:

First, to provide a punch which is well adapted for punching belts of V cross section and having transversely disposed pulley engaging lugs on the innerside thereof.

Second to provide a punch which is easily adjusted to the belt or object to be punched, the object being securely held so that a properly positioned hole results.

Third, to provide a punch in which the dies or cutting members have die blocks associated therewith so as to secure clean-cut holes and at the same time the dies or cutters are not likely to be injured or distorted by use.

Fourth, to provide a punch of this character which is adapt-ed for manual manipulation and at the same time may be rapidly operatedwith comparative ease.

Objects pertaining to details and economies of my invention will definitely appearfrom the description to follow. The invention is defined in the claims.

A structure embodying the features of my invention is clearly illustrated in the accompanying drawing, in which:

Fig. 1 is an elevation of a punch embodying the features of my invention.

Fig. 2 is a fragmentary view mainly 1n section on line 22 of Figs. 1 and 3.

Fig. 3 is a top view, the die block holder being shown in closed position by full lines and in open position by dotted lines. v

Fig. a is a fragmentary perspective view of a belt after has been punched, and

Fig. 5 is a fragmentary section similar to that of Fig.2 with the cutter in its completely actuated position.

The embodiment illustrated in the drawing is a hand tool and comprises a body 1 having longitudinal internally threaded parallel bores 2 therein, there being two of these bores in the structure illustrated. The body is provided with arms 3 disposed in the plane of the bores.

The dies or punches i are threaded into the bores and provided with heads 6 adapted to receive a wrench-like handle member 7 One of the main advantages of this detachable handle is that the single handle will serve Serial No. 555,324.

for both dies, and the dies may be successively manipulated and placed close together. The dies are tubular and the cutter portions 8dof the dies are tapered to a sharp cutting e go.

The work holder consisting of a tiltable member 9 and a fixed member 29 is provided with an opening 10 therein adapted to receive one of the lug-like belt members 11 on the inner side of the belt 12. This belt illustrated is what is known as a V belt, that is, it is of tapered cross section. The tiltable member 9 is provided with an arm portion 13 disposed at the side of the body member and tiltably engaging the pin 14. The member 29 is secured to one side of the arms 3 by means of the screws 30.

The clamping nut 15 on the screw 16 disposed adjacent the work receiving portion of the holder clamps the tiltable member 9 in operatingposition or the position shown in Fig. 2. The tilting of the member9 facilitates the engagement of the work therein.

The die blocks 17 are mounted in operating relation to the dies and have stems 18 with threaded engagement with the die block holder 19. The stems have knurled finger pieces 20 at their outer ends. The die block holder 19 is pivoted at 21 on one of the arms and its outer end has a transversely disposed slot 2.2 adapted to engage the clamping member 23 on the other arm. This die block holder is mounted to swing in a plane transverse to the plane of the punchesso that it may be swung outwardly as indicated by dotted lines in Fig. 3 to permit the adjustment of the work in the holder, and then adjusted to and secured in closed position, and thereafter the die blocks adjusted into clamping engagement with the work as indicated in Fig. 2.

The die blocks have annular recesses 24 in the faces thereof adapted to receive the ends of the dies, which prevents dulling the dies as results from the use of soft metal die blocks, which is common practice with punches of this character. This is a very important feature, as the punching of belts, particularly those made up of rubber compositions, is difficult, and it is manifestly of a very great advantage that the cutter be sharp. The die block being recessed to receive the cutter, the cutters are not dulledv The head of the cutter constitutes a shoulderlike stop 25 engaging with the frame or body of the punch to limit the movement of the cutter. The cutter is shown in the completely actuated position in Fig. 5. The holder supports the belt so that it cannot spring or twist during the punching operation, which would result in a distorted hole and would be very likely to result in a broken or bent cutter. It also insures a clean-cut hole. The punchings or slugs are discharged through the dies.

In my improved punch the work is very securely held, even when it is quite resilient, as is the case with belts formed of rubber composition. The cutter may be driven through belts of substantial thickness with relatively slight effort and the work may be quicklly adjusted to and removed from the unc p I have illustrated and described my imrovements in an embodiment which I have ound verypractical. I have not attempted to illustrate certain embodiments or adaptations as it is believed that this disclosure will enable those skilled in the art to embody or adapt my invention as may be desired.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a device of the class described, the combination of a body member having parallel threaded bores and spaced arms disposed in the longitudinal plane of the bores, a work holder on said body member, tubular dies having threaded engagement with bores in said body member, a die block holder pivotally mounted on one of said arms to swing in a plane transverse to the plane of the arms and having a transverse slot in its outer end, the other arm being provided with a clamping means coacting with said slot, and die blocks provided with stems havin threaded engagement with said holder and having finger pieces at their outer ends, said die blocks having annular recesses in their faces positioned to receive said dies.

'2.-In a device of the class described, the combination of a body member having parallel threaded bores and spaced arms disposed inthe longitudinal plane of the bores, a Work holder comprising a tiltably mounted member on one side of said body member to swing towards the arms thereof and a member fixed to the other side of said body memher, the arms and work holding members forming a work receiving opening in alinement with said bores of said body member, means for clamping said tiltable member in operative position, tubular dies having threaded engagement with said bores in said body member, a die block holder pivotally mounted on one of said arms to swing in a plane transverse to the plane of the arms and having a transverse slot in its outer end, the other arm being provided with a clamping means coacting with said slot, and die blocks provided with stems having threaded engagement with said holder and having finger pieces at their outer ends, said die blocks having annular recesses in their faces positioned to receive said dies.

3. In a device of the class described, the combination of a body member having parallel threaded bores and spaced arms disposed in the longitudinal plane of the bores, a work holder comprising a member tiltably mounted on said body member to swing towards the arms thereof and a member fixed to the other side of said body member, the arm and work holding members forming a work receiving opening in alinement with said bores of said body member, means for clamping said tiltable member in operative position, tubular dies having threaded engagement with said bores in said body member, a die block holder adjust-ably mounted on said arms, and die blocks provided with stems having threaded engagement with said holder and having finger pieces at their outer ends, said die blocks having annular recesses in their faces positioned to receive the said dies.

4. In a device of the class described, the combination of a body member having a threaded bore and spaced arms disposed in the longitudinal plane of the bore, a work holder comprising a member tiltably mounted on said body member to swing towards the arms thereof and a member fixed to the other side of said body member, the arms and work holding members forming a work receiving opening in alinement with said bore of said body member, a tubular die having threaded engagement with said bore in said body memher, a die block holder pivotall i mounted on one of said arms and detacha )ly connected to the other, and a die block adjustably mounted on said holder.

5. In a device of the class described, the combination of a body member having a threaded bore and spaced arms disposed in the longitudinal plane of the bore, a work holder comprising a member tiltably mounted on the side of said body member to swing towards the arms thereof and a member fixed to the other side of said body member, the arms and work holding members forming a work receiving opening in alinement with said bore of said body member, a tubular punch having threaded engagement with said bore in said body member, and a die block mounted on said arms.

In witness whereof I have hereunto set my hand.

JAMES K. DIAMOND.

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